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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6f6f6c4872e8e57dbc390649ee0536d3a7c88c08f96082eb2af13e6d3be2d36' 
  AND token = '6ozgQQ87Rvf9hVPS01FAEecH3o7YEd/rrzIleIUZheU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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