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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd24272deb4501ddb8be4e2927b2536ead1b8acfd67cca31fb5911daa7246ea2e' 
  AND token = 'YCeaqBAkm4ltY6kvEuNsjY+kmG9uD2fjiu4AlgUNjBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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