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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1706e3c4ade7cd7023d16463c5cf91e348b97d17cff5370a11fcfcdfe975850e' 
  AND token = 'Qnh63f1of4HVAVDZ5obRmC9gU3nTsjt/Rombf8vSSXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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