SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff07ed57c0c05ce15f512df0ebecc3d084450aed45250f8f17d8de492b0fb6c6' 
  AND token = 'H4s/FLPBHFXm3e8yw7Rir1NWXZgHPZoHXrQkJKpzGKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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