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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e48cbfff2eaa5b3504577af95fe208320fa97636c05f90363e5462fec4b0748' 
  AND token = 'qROICokyejEtCXvWfTgDxvdO+7SXxyQ6lr2vlS6AXYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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