SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0520fafd0b52b87dedc82b063841ca0df0b67def9ea08d48f1f1c858930bcf07' 
  AND token = 'ltyWgPbPzQtdgTz3rV0OQ+unK47JQc4ZIv4G/Qjo9gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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