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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6799f61b1d6706646a8dbf7c1723c5772e7e40ccb26f03dd28177c9b0d581a95' 
  AND token = 'UzM6ytoC7lrdVy1nh2YwPrsIE1Ar4pPSSknW1IyIJ00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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