SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ee95489c6b6425252b9a8d22896fdc3b826f7f7b87b0a6711cf856bc6d1ffcc' 
  AND token = 'u0GSJvpP2zEhsJzj18mFl7ai0fBWo5cVB9UskfQj8xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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