SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3354338701c13cc5ee94239257926a2228ff7089a20ddc281697d2f28f84f71' 
  AND token = 'DAB6GoYgYTdXtpV9/k8/CJZQjtYlhRBYVS47bkHGV4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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