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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c8da684a51856528181cecc8806890c416775061b4adad4f4f4fb1bbf000913' 
  AND token = 'oC8uIqL7Pa6V8RtfVrhWHi16US5sOTd20XtMRa85/+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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