SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a2c444c15bfc6664b0be7ae6cb97b27ff1097f5b99f089eaab753e0da634ca7' 
  AND token = 'MzYnZpvDSmm8Lasc7+ipss3qljMDJ6MGy8OQghuN0so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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