Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4edddc3ca49d4df1268d8c8c2c72b6c90c84178f9cea688cf6a6ffc7b334e60' 
  AND token = 'GgppMALstWFQ8KUBtWNSc2GEDckjdCCCnCBLBCqTsEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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