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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c441ced2dd5f5e7fa44f140b305dcf2df2c9a360a15b7dbac8f2a3af7700bafa' 
  AND token = 'oyeN+8LV9QkzHnlIpVQ14M+OgrZWhvAqTcPBdcycnA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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