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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad7737122e85f8e53f8c0f2ed35eb9fe9d8eba8a16a76622a93675136c349ac2' 
  AND token = 'QWmKFSRS/DYX05LQ6m30s3ESc6nrUWipBwEw4OoaYzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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