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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cead27191a50e60980e83ff8f466f0463b6eeeb289dd88ba5e74f6af3f84cbac' 
  AND token = '6i2WJq/eONmM1ecy3wUy+puR3V99y31BjrzYl5L5tBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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