SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a04845559ffdfc498a7763ede4d993f64de71663068df6b5d0d2702c38da8a9f' 
  AND token = 'qhduTGWOxxAsh/zOpIrPZXYpJOw3JC6Du7zBMkBs2aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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