SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcbe16d3b09920212e8419abcd5c9897e28e08b13a1f47cea886f16e51746767' 
  AND token = 'CMyUWCS+q+4mhiM84KTgYSzyLBDK7/QXXsnwQRKpPxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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