SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fee362be6eba4567094aa8df1a507e1c4a895bf848db23bbf44a8102c9aec3c' 
  AND token = 'yZTn0IjTFljWhvEg4HmUmfwhpzZn2BDF1uVwRbQCdiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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