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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14ffa5a39b6b45e85943410610223da269e46011118e7ce73927be6ee9712ad0' 
  AND token = 'xPIAaM9PnsV3XbARBvoAol3YPNn2bA6vONS7SiHFlNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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