SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5615e928324df79b97a39c8680e0e4fddc4c188af753621947ce9755c919108e' 
  AND token = 'WaGmvqSPzjBEdcbo9h3ma4RbYqJlI7sx6BMsbAmlDg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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