SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59e12a3f913465c77f5827484bb628eec42a6231fa5ff69921c27f37946d5908' 
  AND token = '0leYf8RVmlYqksqTlA7ZOnsa4GxzzHuIQFTLdMOdpgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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