SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a824c12e4de906b57a9251c74639566f0960373e36bd79e3a61a2bd899ce818f' 
  AND token = '+L4iRFAUyQzph1H/aDOQK8Z4ZgQoCSwmzMifGTOddJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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