SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11fb1b200fa996f9ba59d0eb47bd62dec09e642b687d749fa8b7d5e0b784813a' 
  AND token = 'Vv6a0TvaF0ALBXhMSyPxT3waSwWlhjE6fgmGDYMuvO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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