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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6af92ead93e491f4f445cde8f0add2ad536b1e13d163233d7062b507b7ea0c0c' 
  AND token = '/iYxRmwQLpiRNgGbruyCe123YCQLl7xxBXns4n1ocug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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