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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '794460b3cdfa11bad1f1d2ce390ea60d02ad77b50120e17fa1db676a7491bd2e' 
  AND token = 'JlxdF5KCKFEUJBhIxRUC6kmANgJUKEmliSFQ1szEa8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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