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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d71cb6548cf1b02d4531fc8f9d387551da6ad58e22f00c9c8c5fe72b9f64d7c' 
  AND token = 'bV6aZ8np8VayhAe7RvgqD7PtcMfab3wqW0/o7VBKAYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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