SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d909515869b03d29ba48aaf3f7362932a3572e8ffcf9b3b2c6c77fcccdf3c89' 
  AND token = 'N0FnMX0SQ4eKq+DnezKv/xlMmywfFFtbBb5XIZuKXvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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