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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1bb877808ee79f7feacc1babe02254c60b69fc54e0ad4914e3c1a59e60cd564' 
  AND token = 'wec9QiGIvwQl9+HotCZsO1EJMne+bqjEqeREjHrWMEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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