SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd66816b9168cabdbefae02a172082c90e21d72dbdc1cb8ba489a3a5743b260d8' 
  AND token = 'JJ/rZH8Ud4M6URd50LuIS7QUihEeXHB+JFnZjEYg/Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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