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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e235049a3bfc880b14727c443c023416d6e957066a92f739d238c47752f21de' 
  AND token = 'cEA9wd9gX7XYuChMAS2KGBdpEp4/IsUO/NPWNyIQfdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}