SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a38c16e8f11d58ed9dacc24cba18f357659aa34b4232287249337584c470ef4' 
  AND token = 'wN/Iu41zZhsAUOBf6pUB+Um36krmA541t8JRbYWHND4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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