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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77cf37a3ffd99a82050e644db5c39a39994ff5780032b12c246c0f99b35d8c0a' 
  AND token = 'a5pp//wTf+VM/KXu/il8ace3wwFZakcZ2uZBIH3QWFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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