SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a988063333f103df9a4db7841750f9275cfc5e617b8a0471de2744f527c0bd7' 
  AND token = 'CYRuGIsdzUz+V46Sjuk+nnwMNNTCHHxhqX2wJ2nWxFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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