SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2d439fad9e328241e7ed00d13e8f7a199528b429b36521befb14fe75b764173' 
  AND token = 'uvBxwx/PIiCVGTpD62X9bN6UQeWlqRfyziFT/FV2+gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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