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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a94c1440acd4ff9225a612cc4f1cd94c72904544c7a889996d23c186971d88c' 
  AND token = 'aNbvNIHun/Uhf5Y4ap7TzaD7yMbNh2g9Lq3j4yz2DZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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