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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c26a2d221a3edd5d4c25b886cc964379f526888d4ef570a0c5ff6547c9b1fe5' 
  AND token = '5d9Jf+x0FsH/6kaoTFf8Dh7YD1fa9l9rg5PB5lW6MhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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