SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afca6a3b2a1835a63fd3fe1e91313e18007f41062c640b48c371699739891f38' 
  AND token = 'JhGRV6zMFQ60a9I/Z+rN/PjIoqLdJq3VNoYqSFMl6sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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