Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '999b86999851983d0a0ef7b75920aed1111045db7c75ee984b16037250edfa79' 
  AND token = '5lDISgVKVSI2GEdagkSCAzLBbv8ukPzkkllhxyCrSK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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