SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed983a64b2bb861de58315ff0ec60069fdc1fc0a77daa75865598d2364774293' 
  AND token = '2/jy0CJly/y+bpnA9LOSRIFJq5VNeu1p50GoWKv4LUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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