SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef6e9b80cdb3cc2b73dd327ebf9520f8eff06bd4c199a1e6d52e5d9d191d8ae4' 
  AND token = '1z76e7FCVu4+sklP6Av1EsQDwVUXyGB6YHFJ59QqM1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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