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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69764231822b12c8260d8a564221aa0f2d9b92dab2259c71bfa13bad30492177' 
  AND token = 'jALTawsYV7ejRmFEDp8djnD0sO4H5A1wvvWn2z7rGKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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