SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02c0724f2258ca28530c3cf76cb715996b169baf6aff082bc97bbc5366474d86' 
  AND token = 'hXnnQxeHyTo4KU7L1sKjs9o/hGNgLgyAJKe5cwlTy/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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