SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0692874a214a252710ebbac3cb62acf9b0f6ea484d46a4780dda841798b9261' 
  AND token = 'zlDBAcq/F3VfZXYd/OCDHPgGx2sOfjn6FUyg7y4Q3fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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