SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d97166f064de63f39b5564295794a3ff182c8645faef2ce3fa708b6b4900324' 
  AND token = '8rzaQucurq/p0Ydl3IG2tLCcMJQnrf+YsG2T+NnJTuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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