SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1176a5989ca5d6a8c9eb70de29f3e005473e36def4b663bb72c3748f774c9a33' 
  AND token = 'ruL1xoT3S7OZFzMVbYswmFmQhN+zCVlLTzWN0dUbw5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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