SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31da1e2b0c57e19bbbbdff5583e7b0f9601df712d6d51ebb0a64469fedc24071' 
  AND token = 'qKNkzwvzwUHJqTxyN7R4AVmuDPIRHbf5TIqJaEfjI8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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