SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a62c16bb72d57595c62eafa0db82bc91ff61d4781300e7794f9f19807cbca42' 
  AND token = 'yjmpuWfwOtOEHvgf2Kc8WZaLK+J5Udap8z6h24YV8yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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