SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ee5a0b0a2ed615665709664277e9d687a4ff356b99780f7b675ed98e5afb24d' 
  AND token = 'xkC1H6uGiZ8Yw+AI2LA1XZz7CQLpEVLY/QFdwI2/Iyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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