SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2abe004e27e654f88f4d820dae906b182bfda663ae326b504da08fba691e16f3' 
  AND token = 'sMbBt/Z+zG1d6nLNOIPpRfs5Px7GhqLgZrADnmrh78U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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