SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1035fc76754f035a07c491023bdb276dcdf4f49faa01d1c73363ee7409e21598' 
  AND token = 'y6GHdJw0jghwC2Yif5SkBQ71QFyHE09xPSC/M8vqSeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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