Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae2bab2a6fd1973ef1a236f6f07922ea5531cd9fd5d5d596af0bb3aa734a3a39' 
  AND token = 'ZQ1DXJ1A6CQbLHmJN1WRg0rLFHHe/m2tdM/dc2BT7+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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