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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c926b73347926b3ab51ee47def36e3e6285e00bd764c9d6da3b5c4612150efb' 
  AND token = 'oXqMy5ogTgfF66etfPoqZUlJGkG05nE8y11PdfK29Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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