SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c57acbd92f8c3f0f915e54eafce4d796ebafe4d1a0f4cd4e51e3e3c2fb6b37d' 
  AND token = 'PrFlCIpSMTpnGlzmLyj7Vm9pI+hq5nGx2gwK2w8T2zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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