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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '317c4cd5fc0ded7f38b25b8abede32b6bea0f401ace3181b29ec99983c1062c8' 
  AND token = 'IjNXgv3lycf8mpsV13C1TEuVJ7xFCepZxvtWVDzoyT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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