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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe3301f995d0ee18b462c0a3afcfba458007eb53380164aea2f9f4a1916b6892' 
  AND token = '1xY/rbALdKRUl2e7vThS0ethp4ZBam3E56M8s0gYgN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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