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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5796311e061b50ad410b4b104cb3e1fb80ba170639649dfc967fc555865c5b1' 
  AND token = 'yoFlOda0lbaz3R560hY4xC7pNawbl7wCljdi0w0+Czw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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