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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ebc7fcd8844edb69b35621527ce5f0baa2b0bf583b59527e28fc4ec153219fe' 
  AND token = 'JtevT1ariexgE3uo8JwKSzQqlYTz0FrEQ0RTi4wVrzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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