SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5058cf7e2cf4c9cca1f885aadb7612203995d27f65ae14d3ac6b46c16107b909' 
  AND token = 'LMR1ytYXzHqkj+fB8A6ZiLW/DJj3DWFQIY8fe1x733U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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